5.21
Posted xxy02160216
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package ffff; import java.util.Scanner; public interface Shuiguo{ } class Apple implements Shuiguo { public Apple() { System.out.println("创建了一个苹果对象"); } } class bunana implements Shuiguo { public bunana () { System.out.println("创建了一个香蕉对象"); } } class putao implements Shuiguo { public void putao() { System.out.println("创建了一个葡萄对象"); } } class Gardener{ public Shuiguo create() { Scanner input = new Scanner(System.in); String name = input.next(); Shuiguo shuiguo = null; switch(name){ case "苹果": shuiguo = new Apple(); break; case "香蕉": shuiguo = new bunana(); break; case "葡萄": shuiguo = new putao(); break; } input.close(); return shuiguo ; } }
public class Test1 { public static void main(String[] args) { Gardener g = new Gardener(); g.create(); } }
设计四个类,分别是:(知识点:抽象类及抽象方法)
(1)Shape表示图形类,有面积属性area、周长属性per,颜色属性color,有两个构造方法(一个是默认的、一个是为颜色赋值的),还有3个抽象方法,分别是:getArea计算面积、getPer计算周长、showAll输出所有信息,还有一个求颜色的方法getColor。
(2)2个子类:
1)Rectangle表示矩形类,增加两个属性,Width表示长度、height表示宽度,重写getPer、getArea和showAll三个方法,另外又增加一个构造方法(一个是默认的、一个是为高度、宽度、颜色赋值的)。
2)Circle表示圆类,增加1个属性,radius表示半径,重写getPer、getArea和showAll三个方法,另外又增加两个构造方法(为半径、颜色赋值的)。
(3)一个测试类PolyDemo,在main方法中,声明创建每个子类的对象,并调用2个子类的showAll方法。
package ffff;
public abstract class Shape {
protected int area;
protected int per;
protected String color;
public Shape() {
// TODO Auto-generated constructor stub
}
public Shape( String color) {
this.color = color;
}
public abstract void getArea();
public abstract void getPer();
public abstract void showall();
}
package ffff; public class Rwctangle extends Shape{ private int chang; private int kuan; public Rwctangle() { // TODO Auto-generated constructor stub } public Rwctangle(String color) { super(color); // TODO Auto-generated constructor stub } public Rwctangle(int chang, int kuan,String color) { super(); this.chang = chang; this.kuan = kuan; this.color=color; } @Override public void getArea() { // TODO Auto-generated method stub System.out.println("面积为"+chang*kuan); } @Override public void getPer() { // TODO Auto-generated method stub System.out.println("周长为"+2*(chang+kuan)); } @Override public void showall() { // TODO Auto-generated method stub System.out.println(chang+kuan+color); } }
package ffff; public class Circle extends Shape { double radius; public Circle() { } public Circle(double radius, String color) { this.color = color; this.radius = radius; } @Override public void getArea() { // TODO Auto-generated method stub area=(int) (radius*radius*3.14); } @Override public void getPer() { // TODO Auto-generated method stub per=(int) (2*3.14*radius); } @Override public void showall() { // TODO Auto-generated method stub System.out.println("面积"+area+"周长"+per+"颜色"+color); } }
package ffff; public class tese2 { Rwctangle r=new Rwctangle(5,5,"ss"); Circle c= new Circle(4,"kk"); r.getArea(); r.getper(); r.showall; c.getArea(); c.getper(); c.showall; }
Cola公司的雇员分为以下若干类:(知识点:多态)
(1) ColaEmployee :这是所有员工总的父类,属性:员工的姓名,员工的生日月份。
方法:getSalary(int month) 根据参数月份来确定工资,如果该月员工过生日,则公司会额外奖励100 元。
(2) SalariedEmployee : ColaEmployee 的子类,拿固定工资的员工。
属性:月薪
(3) HourlyEmployee :ColaEmployee 的子类,按小时拿工资的员工,每月工作超出160 小时的部分按照1.5 倍工资发放。
属性:每小时的工资、每月工作的小时数
(4) SalesEmployee :ColaEmployee 的子类,销售人员,工资由月销售额和提成率决定。
属性:月销售额、提成率
(5) 定义一个类Company,在该类中写一个方法,调用该方法可以打印出某月某个员工的工资数额,写一个测试类TestCompany,在main方法,把若干各种类型的员工放在一个ColaEmployee 数组里,并单元出数组中每个员工当月的工资。
package ffff; public class ColaEmployee { String name; int month; public ColaEmployee() { super(); // TODO Auto-generated constructor stub } public ColaEmployee(String name, int month) { super(); this.name = name; this.month = month; } public double getSalary(int mouth){ return 0; } }
package ffff; public class SalariedEmployee extends ColaEmployee { double salary; public SalariedEmployee(String name, int month,double salary) { super(name, month); this.salary=salary; // TODO Auto-generated constructor stub } public double getSalary(int mouth){ if(super.month==month){ return salary+1000; } else{ return salary; } } }
package ffff; public class HourlyEmployee extends ColaEmployee{ private int hoursalary; private int hour; public HourlyEmployee(String name, int month,int hoursalary,int hour) { super(name, month); this.hoursalary=hoursalary; this.hour=hour; // TODO Auto-generated constructor stub } public double getSalary(int mouth){ if(super.month==mouth){ if(hour>160){ return hoursalary*160+hoursalary*(hour-160)*1.5+100; } } else{ if(hour<160){ return hoursalary*hour; } } return mouth; } }
package ffff; public class SalesEmployee extends ColaEmployee { private int monthSales; private double royaltyRate; public SalesEmployee( String name,int mouth,int monthSales, double royaltyRate) { super(name,mouth); this.monthSales = monthSales; this.royaltyRate = royaltyRate; } public double getSalary(int month) { if(super.month == month) { return monthSales * royaltyRate + 100; }else { return monthSales * royaltyRate; } } }
package ffff; public class Company { public void getSalary(ColaEmployee c,int month) { System.out.println(c.name + "在" + month + "月的月薪是: " + c.getSalary(month)+"元"); } }
package ffff; public class Test4 { public static void main(String[] args) { // TODO Auto-generated method stub ColaEmployee[] cel = { new SalariedEmployee("zhangsan", 5, 10000), new HourlyEmployee("lisi", 7, 100, 300), new SalesEmployee("wangwu", 3, 8000, 0.6) }; for (int i = 0; i < cel.length; i++) { new Company().getSalary(cel[i],5); } } }
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